I think, just like with J.K. Rowling, it's going to be up to the individual to what extent they can, in good conscience, engage with the art, whether that be enjoying what they have or buying new materials from it. I also think that it's up to the rest of us not judge other people's decisions on the the matter. I myself will probably be considering if I still want to buy new Firefly stuff, but I don't see any reason to look down on anyone who doesn't find the idea of continuing to consume the franchise problematic.